Two-stroke engine with pneumatic injection and flowrate restrict

Details Two-stroke engine with pneumatic injection and flowrate restrict Two-stroke engine with pneumatic injection and flowrate restrict

1988-10-06

1990-07-31

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 73C, 123323, F02B 3304

Patent

active

049442554

ABSTRACT:
A two-stroke engine having at least one cylinder in which a piston is movably accommodated, with a crank case communicating with one end of the at least one cylinder. Air is admitted to the crank case and at least one pipe admits unmixed air from the crank case to a cylinder transfer port. The fuel is pneumatically injected into the cylinder by way of a pneumatic injector and a pipe connected to the crank case by a valve and forming a volume of pressurized air connected to the pneumatic injector supplies the pneumatic injector with pressurized air for atomizing the fuel. An exhaust pipe is connected to the at least one cylinder by an exhaust port located in a position offset in a direction of travel of the piston with respect to the cylindrical transfer port of the cylinder. At least one restricting element is disposed inside the exhaust pipe in a vicinity of the cylinder for restricting a passage of the exhaust gases, with the restricting element being controlled and adjusted as a function of at least one engine operating parameter.

REFERENCES:
patent: 1818796 (1931-08-01), Fevens
patent: 3190271 (1965-06-01), Gudmundsen
patent: 3938330 (1976-02-01), Nakajima et al.
patent: 4180029 (1979-12-01), Onishi
patent: 4445468 (1984-05-01), Onishi et al.
patent: 4579093 (1986-04-01), Eanes
372 "Automotive Engineering" 94, (1986) Aug., No. 8, Warrendale, Pa., Pneumatic Fuel Injection Spurs Two-Stroke Revival.
Patent Abstracts of Japan vol. 3, No. 186 (M-320) (1623) Aug. 25, 1984 (2 pages); appl. No. 57-187754.

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